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is designed to report thread progress to an interested party, which usually involves a UI.

The MSDN documentation for the class makes this abundantly clear.

This is quite a surprise to people who are new to Windows programming, when they first do something that takes more than a second and realize that their application actually hangs while doing so.

The result is a lot of frustrated forum posts from people who are trying to run a lengthy process while updating a progress bar, only to realize that the progress bar is not updated until the process is done running.

This is where Windows Forms programming can get quite complex.

Access to Windows Forms controls is not inherently thread safe.

By default, each time your application executes a piece of code, this code is run on the same thread as the application itself.

This means that while this code is running, nothing else happens inside of your application, including the updating of your UI.

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Join the background worker until it really does exit and then let the Dispose of the form continue?is really intended for operations that you don't want to tie up the UI with and have an finite end - like downloading a file, or processing a sequence of items.In this case the "end" is unknown and only when the window is closed.The most difficult concept about multi-threading in a Windows application is the fact that you are not allowed to make changes to the UI from another thread - if you do, the application will immediately crash.Instead, you have to invoke a method on the UI (main) thread which then makes the desired changes.




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Because of their strength of intuition (and commensurate detachment from physical reality), many INFJs report feeling like aliens in the world.


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